This totally rocks for first version. Congratz.<p>I have the same concerns as you. I currently use Diigo (after failed attempt on number of others, Google Bookmarks to be the worst in my experience) but it suffers from not having hierarchical tags which I find to be major problem. It does however let your recent tags be reapplied in single click so it covers a lot of scenarios for me - instead hierarchy I prefix my tags with 'tag category'. Lets say I research if PostgreSql is good enough so I have number of URLs all start with `database postgresql more other tags`. First 2 I will have on all URLs and will change 'more other tags' part. Diigo lets me quickly click latest tags and I manually add others. Later I can quickly drill down on tags I want and limit on hierarchy. Diigo also recommend tags to make this even easier.<p>One other thing I find indispensable is Diigos annotations, here is an example of your article with 2 tags and 2 annotations:<p><a href="https://ibin.co/3CTiLPkv1Jtr.png" rel="nofollow">https://ibin.co/3CTiLPkv1Jtr.png</a><p>Since it allows for sharing, I can quickly share important bits from documentation that are relevant for colleges or lets me personally remember important aspects of entire page. This is major feature for me and if geekmarks eventually supports it I would switch to it without thinking (especially as Diigo is not free, although I use free variant that doesn't limit me in most important aspects).<p>Other things that Diigo offers such as caching, sharing, outliners etc. I can either live without or use some scripting to allow with geekmarks. Recent update of Android client finally made it usable and it works on phone too, something that is nice but it could be easily reimplemented using your API.<p>Thanks for your work on this.